CNW 4160, model GP7, built 12/51, builder number 17597, acquired by C&NW in 1/81, previous road number RI 4506, C&NW paint scheme TY [Traditional Yellow; modern version of the "Stagecoach yellow" used from 1991 to merger]. [Source: The Final North Western Motive Power Roster. Courtesy of The Run of the Ge's, The Chicago & North Western Historical Society, Library of Congress catalog card number 95-83545, 1995, page 58.]

C&NW 4160 was built in October 1952, GM EMD GP7R, builder number 17597, as Chicago Rock Island & Pacific 1266, later numbered as Chicago Rock Island & Pacific 4506. Purchased by Precision National Corporation, Mr. Vernon, Illinois, in 1974 or 1975, rebuilt in 1957 or 1976 for Precision National Corporation, and leased back to Chicago Rock Island & Pacific. Returned to Precision National Corporation after Chicago Rock Island & Pacific shut down in April 1980 and leased to C&NW, entering service in 1981. [courtesy of Union Pacific Locomotive Directory, Don Strack, Withers Publishing, ISBN 1-881411-16-8, 1998]